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this gorgeous map. They first created a model, which calculated how long it would take to travel from a given point, to the nearest city of 50,000 people or more; the model includes rail, road, and river networks. Then they plotted these results on a color coded map: The brighter an area, the closer it is to a big city; the darker it is, the further out it is. (The blue lines above represent oceanic shipping lanes.)